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No. 607,648. Patented Iuly I9, |898. A. SCHWARZ.

CONTINUOUS PHUTOGRAPHIC PRINTING APPARATUS.

(Application filed Mar. 29, 1897.) (No Model.) 2 Sheets-Sheet l.

we Ncnm persas cc vnmomwo.. mamme n cv Patented .IuIy I9, |898. A.SCHWARZ.

CONTINUOUS PHOTOGRAPHIE PRINTING APPARATUS.

(Application led Max. 29, 1897.)

2 Sheets-Sheet 2.

(No Model.)

Now-uma.. www5 UNITED STATES PATENT OEEIcE.

ARTHUR SCT'DVARZ, OF BERLlN-SOHNEBERG, GERMANY.

CONTINUOUS PHOTOGRAPHlC-PRINTING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 607,648, dated July 19,1898- Application filed March 29, 1897.

To o/Z/ whom it may concern:

13e it known that I, ARTHUR SCHWARZ, a subject of the German Emperor,residing at Berlin-Schneberg, Germany, have invented certain new anduseful Improvements in Continuous Photographic-Printing Apparatus, ofwhich the following is a speciiication.

In the well-known devices for exposing sensitized paper for makingcopies the negative is pressed firmly against the sensitized paper bymeans of ablanket. lVhen the paper has been sui'ciently exposed, freshpaper must be placed under the negative, and for this purpose theblanket must be removed. iVhile this method will answer the purpose ifonly a small number of copies are to be made, it is obvious that whenvery large numbers of copies are desired the continual removal andreadjustment of the blanket will cause a considerable loss of time.

My invention has for its purpose to remove this disadvantage; and tothis end I have devised a circulating or endless blanket moving around acylinder, the negatives being placed upon the cylinder, the blanket,orupon both.

A method of carrying my invention into practice is diagrammaticallyshown in the annexed drawings,making a part of this speciication, andwherein- Figure l shows a side view in section of a copying apparatuswith endless blanket, the negatives being arranged upon the cylinder.Fig. 2 shows a similar view of a copying apparatus adapted for exposingpaper sensitized on both sides, and Fig. 3 shows a cross-section of Fig.2.

Referring to Fig. l, the transparent negatives h of the pictures aresuitably xed upon a transparent or translucent cylinder A, rotating withor upon its axle a. Around this cylinder is suitably guided the strip ofsensitized paper D, which is fed at X and carried olf at Y. Around thecylinder A, which is preferably mounted in ahinged frame (l, areprovided at suitable places rcllsc c/ c2 c3, dac., around which anendless blanket D is moved, so that it also surrounds the cylinder. Thisblanket is adapted firmly to press the sensitized paper against thenegatives l), arranged upon the cylinder A, and the necessary pres-Serial No. 629,796. (No model.)

su re is obtained by means of the pressure-roll E, located between theguiding-rolls c3 and c, as shown. It is obvious, ofcourse, that theprcssureroll E must be adjustable in its position in relation to thecylinder A, so that by moving this roll nearer to the cylinder thepressure of the blanket upon the sensitized paper can be regulated atwill.

It is clear that when the cylinder A is rotated it will carry along boththe sensitized paper B and the blanket D, both being firmly adjustedagainst its circumference, and that while 'fresh sensitized paper isbeing continually fed the blanket will continually move around the rollsc to c7 and the cylinder A.

The speed of the cylinder A is so regulated that the picture is fullydeveloped during the time the sensitized paper performs its motionaround the cylinder. lf new negatives are to be placed upon thecylinder, the frame is opened, so that it will assume the position Shownin dotted lines in the drawings, and the new negatives can now be placedon the cylinder whereby the same is rotated.

In the construction above described the cylinder A is transparent andthe source of light-for instance, in the shape of one or more electriclamps-is arranged within the cylinder. The arrangement of such electriclamps o in the cylinder is shown in Figs. 2 and 3; but this arrangementmay be varied, as it is also possible to use an opaque cylinder,provided the blanket be made of a transparent or translucent fabric. Inthis case the negatives are arranged upon the blanket and move with thesame around the cylinder A and theV guiding-rolls c to c7 and will adjust themselves when reaching the cylinder upon the sensitized paper.They will remain in this position until the blanket leaves the cylinderand move then around the guiding-rolls until they reach the place wherethe sensitized paper is released. In this construction the source oflight is provided at the outside, and the light is thrown through theblanket D and the negatives l) upon the sensitized paper, while in theconstruction first described it goes from the interior of the cylinderthrough the negatives to the paper.

In Figs. 2 and 3 l have illustrated a circular copying apparatus adaptedfor exposing IOO paper sensitized on both sides. The construetion issubstantially the same as for the single copying apparatus; but both thecylinder and the blanket must be transparent or translucent. The endlesstransparent blanket C is moved about the transparent cylinder A in themanner heretofore described by means of the rolls c c c2 c3, &c., andthe tension of the blanket is also regulated in the same manner by meansof the adjustable pressure-roll E. The negatives b are arranged upon thecylinderA and the negatives b on the blanket D, so that when thecylinder is rotated, thereby imparting motion to the blanket, thenegatives Z1 and b will exactly cover each other. The paper B',sensitized on both sides, passes between the negatives of the cylinderand those attached to the blanket, the feed and release places beingentirely as shown in Fig. l and as near together as practicable in orderto use as much as possible the entire circumference of the cylinder.Between the part of the blanket surrounding the cylinder and the partpassing over the rolls c to c7 is an open space, wherein the electriclamps o can be conveniently placed. These lamps are attached to suitablesupports O, that must of course be held to a suitable frame. (Not shownin the drawings.) For the exposure of the inner side of the sensitizedpaper B similar electric lamps o are located within the cylinder A.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. An exposing device for making copies on sensitized paper, providedwith an endless blanket, and means for exerting pressure upon theblanket and upon theV negatives from which the copies are to be made,substantially as and for the purposes described.

2. An exposing device for making copies on sensitized paper, providedwith a transparent or translucent endless blanket, substantially as andfor the purpose described and set forth.

3. An exposing device for making copies on paper sensitized on bothsides, provided with a transparent or translucent blanket, circulatingabout a transparent or translucent cylinder, substantially as and forthe purpose described and set forth.

4. In an exposing device, the combination of a rotary cylinder, anendless blanket circulating around this cylinder, and adapted to pressthe negatives upon the sensitized paper, substantially as described.

5. In an apparatus for exposing paper sensitized on both sides, acylinder around which the blanket is passed, means for sustaining aportion of the blanket at a distance from the cylinder so as Ato leave aspace between the cylinder and said portion of the blanket, and electriclamps located in said space, substantially as and for the purposesdescribed.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

ARTHUR SCHWARZ.

Witnesses:

HENRY HAsPER, W. HAUPT.

